33381664 has 12 divisors (see below), whose sum is σ = 65720214. Its totient is φ = 16690816.

The previous prime is 33381661. The next prime is 33381683. The reversal of 33381664 is 46618333.

It can be written as a sum of positive squares in only one way, i.e., 26091664 + 7290000 = 5108^2 + 2700^2 .

It is a super-2 number, since 2×33381664² = 2228670982817792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33381661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521557 + ... + 521620.

Almost surely, 2^33381664 is an apocalyptic number.

It is an amenable number.

33381664 is a deficient number, since it is larger than the sum of its proper divisors (32338550).

33381664 is a wasteful number, since it uses less digits than its factorization.

33381664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043187 (or 1043179 counting only the distinct ones).

The product of its digits is 31104, while the sum is 34.

The square root of 33381664 is about 5777.6867343254. The cubic root of 33381664 is about 321.9852622397.

Adding to 33381664 its reverse (46618333), we get a palindrome (79999997).

The spelling of 33381664 in words is "thirty-three million, three hundred eighty-one thousand, six hundred sixty-four".